JP6963529B2 - Seismic isolation damper - Google Patents

Description

The present invention relates to a seismic isolation damper.

The seismic isolation bearing device is equipped with a seismic isolation bearing device such as a ball isolator or laminated rubber that is interposed between the ground and the structure, and supports the structure so that it can move with respect to the ground. Insulate transmission to objects. In addition to the above-mentioned seismic isolation bearing device, the seismic isolation bearing device may be provided with a seismic isolation damper interposed between the ground and the structure. In this case, the vibration of the structure is generated. The damping force generated by the seismic isolation damper dampens and suppresses the vibration of the structure.

In the seismic isolation bearing device, the smaller the damping force of the seismic isolation damper in the event of an earthquake, the more difficult it is to transmit the vibration of the ground to the building, and it is possible to secure high vibration insulation. On the other hand, the seismic isolation bearing device suppresses the movement of the structure by the damping force generated by the seismic isolation damper for large-scale seismic motion in which the structure moves with a large amplitude with respect to the ground. It is necessary to prevent the structure from falling out of the bearing device and collision between the structure and the retaining wall surrounding the lower end of the structure.

Therefore, in the seismic isolation bearing device, the damping force is not exerted as much as possible on the seismic isolation damper so as not to hinder the vibration insulation of the seismic isolation bearing device for vibrations of small amplitude, and for vibrations of large amplitude. Therefore, it is preferable that the seismic isolation damper actively exerts a damping force.

In order to meet such demands, seismic isolation dampers that can change the damping force depending on the displacement have been proposed. In such seismic isolation dampers, a mechanism for transmitting the displacement of the damper to the valve has been proposed. Is installed outside the cylinder, and the mechanism drives the valve to open and close the flow path to change the damping force. Therefore, in this seismic isolation damper, since a block having a flow path provided with a valve outside the cylinder and the mechanism are provided, these blocks and the mechanism interfere with other parts when installed in a building. There is a possibility and it will be an obstacle during transportation.

In order to solve this problem, there are two holes that penetrate the cylinder without an external mechanism, a bypass path that connects these holes and bypasses the damping valve provided on the piston, and a piston in the passage. A seismic isolation damper has been developed in which a valve that opens and closes a passage according to a moving speed with respect to the cylinder is provided, and the damping force is changed depending on the displacement of the piston with respect to the cylinder without providing an external mechanism (for example, Patent Document). 1).

In this conventional seismic isolation damper, when the piston is in the sliding range on the center side with respect to the cylinder, the bypass path is effectively functioned to reduce the damping force, and even if the bypass path is effective, the piston When the moving speed becomes high, the valve blocks the bypass path and does not reduce the damping force.

JP-A-2017-96433

However, in such a seismic isolation damper that does not require an external mechanism, the pressure in the cylinder rises due to the base valve when the rod contracts because the rod is a single rod type that is inserted only into the extension side chamber. However, the damping force is exerted in proportion to the increase in the pressure inside the cylinder.

However, the seismic isolation damper has only a bypass path that bypasses only the damping valve provided on the piston, and although the bypass path can function to reduce the damping force during the extension operation, the bypass is bypassed during the contraction operation. The function of the road is halved. Therefore, with the conventional seismic isolation damper, it is difficult to match the damping force characteristics between the extension operation and the contraction operation.

Therefore, an object of the present invention is to provide a seismic isolation damper capable of easily matching the damping force characteristics during the extension operation and the contraction operation even if the damping force depending on the displacement can be exhibited.

In order to achieve the above object, the seismic isolation damper of the present invention is inserted into the cylinder, a piston that is slidably inserted into the cylinder and divides the inside of the cylinder into an extension side chamber and a compression side chamber, and a cylinder. A rod whose one end is connected to a piston, a tank for storing liquid, an extension-side damping passage and a compression-side damping passage for communicating between an extension-side chamber and a compression-side chamber, and a discharge passage and a suction passage for communicating between a compression-side chamber and a tank. The first extension side damping valve provided in the passage and the extension side damping passage to allow only the flow of liquid from the extension side chamber to the compression side chamber and to resist the flow of the passing liquid, and the first extension side damping valve provided in the compression side damping passage. Only the flow of liquid from the compression side chamber to the extension side chamber is allowed, and only the first compression side damping valve that resists the flow of liquid passing through and the flow of liquid provided in the discharge passage from the compression side chamber to the tank are allowed. A first base valve that resists the flow of liquid that passes along with it, a check valve that is installed in the suction passage and allows only the flow of liquid from the tank to the compression side chamber, and a predetermined range set on the center side of the cylinder. The extension side bypass path and the compression side bypass path that communicate the extension side chamber and the compression side chamber only when the piston is located, and the compression side chamber and the tank only when the piston is on the extension side chamber side including a predetermined range with respect to the cylinder. A second extension side damping valve provided in the extension side bypass path that allows only the flow of liquid from the extension side chamber to the compression side chamber and resists the flow of liquid passing through. When the extension side bypass path is provided in the side bypass path and the extension side bypass path communicates with the extension side chamber and the compression side chamber, the extension side bypass path is blocked when the moving speed of the piston toward the extension side chamber side with respect to the cylinder exceeds a predetermined speed. A side speed-dependent on-off valve, a second compression side damping valve provided in the compression side bypass path that allows only the flow of liquid from the compression side chamber to the extension side chamber, and a second compression side damping valve that resists the passing liquid flow, and a compression side bypass path. When the compression side bypass path communicates between the compression side chamber and the extension side chamber, the compression side speed-dependent opening / closing valve that shuts off the compression side bypass path when the moving speed of the piston to the compression side chamber side with respect to the cylinder exceeds a predetermined speed, and discharge. The second base valve provided in the side bypass path to allow only the flow of liquid from the compression side chamber to the tank and to resist the flow of liquid passing through, and the discharge side bypass path provided in the discharge side bypass path are on the compression side. When the chamber and the tank are communicated, the piston is transferred to the compression side chamber side with respect to the cylinder. A discharge-side speed-dependent opening / closing valve that shuts off the discharge-side bypass path when the dynamic speed exceeds a predetermined speed, and a cylinder provided in the discharge-side bypass path when the discharge-side bypass path communicates with the compression side chamber and the tank. It is equipped with a discharge side opening / closing valve that opens the discharge side bypass path only when the piston moves to the compression side chamber side.

In the seismic isolation damper configured in this way, when each bypass path is enabled, the second extension side damping valve is used for the first extension side damping valve, and the second compression side damping valve is used for the first compression side damping valve. However, the second base valve functions effectively as opposed to the first base valve. Therefore, even when the seismic isolation damper contracts, if the piston is located within a predetermined range with respect to the cylinder and the moving speed of the piston is lower than the predetermined speed, not only the first base valve but also the second base valve Since the liquid can be discharged from the inside of the cylinder to the tank through the pipe, the damping force during the contraction operation can be reduced as compared with the conventional seismic isolation damper.

Therefore, according to the seismic isolation damper of the present invention, even if the damping force depending on the displacement can be exerted, the damping force characteristics during the extension operation and the contraction operation can be easily matched.

It is a side view in the state in which the seismic isolation damper in one embodiment is interposed between the structure and the ground together with the seismic isolation bearing device. It is sectional drawing of the seismic isolation damper in one Embodiment. It is a circuit diagram of the seismic isolation damper in one Embodiment. It is a figure which showed the characteristic of the damping force with respect to the moving speed of the piston of the seismic isolation damper in one Embodiment.

Hereinafter, the present invention will be described based on the embodiments shown in the figure. As shown in FIG. 1, the seismic isolation damper D in one embodiment is interposed between the structure S and the ground G together with the seismic isolation bearing device M composed of laminated rubber placed horizontally and horizontally. .. As the seismic isolation bearing device M, in addition to laminated rubber, a device S such as a ball isolator that can allow the structure S to move in the horizontal direction can be adopted.

Then, as shown in FIG. 2, the seismic isolation damper D includes a cylinder 1, a piston 2 that is slidably inserted into the cylinder 1 and divides the inside of the cylinder 1 into an extension side chamber R1 and a compression side chamber R2. A rod 3 that is inserted into the cylinder 1 and one end of which is connected to the piston 2, a tank T that stores liquid, an extension side damping passage 4 and a compression side damping passage 5 that communicate the extension side chamber R1 and the compression side chamber R2. The discharge passage 6 and the suction passage 7 that communicate the compression side chamber R2 and the tank T, the extension side bypass passage 8 and the compression side bypass passage 9 that communicate the extension side chamber R1 and the compression side chamber R2, and the compression side chamber R2 and the tank T. The discharge side bypass path 10 that communicates with the first extension side damping valve 11, the first compression side damping valve 12, the first base valve 13, the check valve 14, the second extension side damping valve 15, the second compression side damping valve 16, the first. The two base valve 17, the extension side speed-dependent opening / closing valve 18, the compression side speed-dependent opening / closing valve 19, the discharge side speed-dependent opening / closing valve 20, and the discharge side opening / closing valve 21 are provided.

The extension side chamber R1 and the compression side chamber R2 are each filled with hydraulic oil as a liquid, and the tank T is filled with the hydraulic oil as a liquid and a gas. Although the liquid is used as hydraulic oil in this example, it may be used as another liquid such as water or an aqueous solution. The gas is preferably an inert gas such as nitrogen that does not cause deterioration of the hydraulic oil, but other gases such as the atmosphere can also be used.

Hereinafter, each part of the seismic isolation damper D will be described in detail. A valve case 22 is fitted to one end of the cylinder 1, and a rod guide 23 is fitted to the other end. Further, on the outside of the cylinder 1, an outer cylinder 24 is provided which covers the outer periphery of the cylinder 1 and forms a tank T in an annular gap between the cylinder 1 and the cylinder 1. One end of the outer cylinder 24 is closed by the cap 25, and the other end of the outer cylinder 24 is closed by the rod guide 23. The cylinder 1 is sandwiched by a rod guide 23 mounted on the outer cylinder 24 and a valve case 22 that abuts on the cap 25, and is accommodated and fixed in the outer cylinder 24. Therefore, the left end of the cylinder 1 in FIG. 2 is closed by the rod guide 23, and the right end of the cylinder 1 in FIG. 2 is closed by the valve case 22.

The piston 2 is slidably inserted into the cylinder 1, and the inside of the cylinder 1 is divided into an extension side chamber R1 and a compression side chamber R2, and a seismic isolation damper D is between the structure S and the ground G. When it is in a stationary state, it is positioned at the neutral position, which is the center of the cylinder 1. The neutral position is not limited to the center of the cylinder 1, but in the seismic isolation damper D, the moving distance from the neutral position of the piston 2 to the stroke limit is generally equal on both the extension side and the contraction side. Is set.

Further, one end of the rod 3 is movably inserted into the cylinder 1 through the rod guide 23 and connected to the piston 2, and the other end protrudes outside the cylinder 1. Therefore, the seismic isolation damper D is a so-called single rod type damper in which the rod 3 is inserted only into the extension side chamber R1.

The cap 25 is provided with a bracket 25a connected to the mounting portion Bs provided on the structure S, and a bracket 3a connected to the mounting portion Bg provided on the ground G is provided at the other end of the rod 3. , Brackets 3a and 25a allow the seismic isolation damper D to be installed between the structure S and the ground G.

In the present embodiment, the piston 2 includes an extension side damping passage 4 and a compression side damping passage 5 that communicate the extension side chamber R1 and the compression side chamber R2, and a first extension side damping valve provided in the extension side damping passage 4. 11 and a first compression side damping valve 12 provided in the compression side damping passage 5 are provided.

The first extension side damping valve 11 allows only the flow of hydraulic oil from the extension side chamber R1 to the compression side chamber R2, and also provides resistance to the flow of hydraulic oil passing through. More specifically, in the present embodiment, the first extension side damping valve 11 is a pressure regulating valve as shown in FIG. 3, and when the passing flow rate reaches a predetermined flow rate, the pressure loss increases with respect to the flow rate increase. It has the property of reducing the proportion.

The first compression side damping valve 12 allows only the flow of hydraulic oil from the compression side chamber R2 to the extension side chamber R1 and provides resistance to the flow of hydraulic oil passing through. More specifically, the first pressure side damping valve 12 is a pressure regulating valve in the present embodiment, like the first extension side damping valve 11, and when the passing flow rate reaches a predetermined flow rate, the pressure loss with respect to the flow rate increase. It has the property of decreasing the rate of increase.

The valve case 22 divides the inside of the cylinder 1 and the tank T, includes a discharge passage 6 and a suction passage 7 for communicating the compression side chamber R2 and the tank T, and a first base provided in the discharge passage 6. It includes a valve 13 and a check valve 14 provided in the suction passage 7.

The first base valve 13 allows only the flow of hydraulic oil from the compression side chamber R2 to the tank T and provides resistance to the flow of hydraulic oil passing through. More specifically, the first base valve 13 is a pressure regulating valve in the present embodiment, like the first extension side damping valve 11, and when the passing flow rate reaches a predetermined flow rate, the pressure loss due to the increase in the flow rate It has the characteristic that the rate of increase decreases. Further, the check valve 14 is a one-way passage that allows only the flow of hydraulic oil from the compression side chamber R2 to the tank T and allows only the flow of hydraulic oil from the tank T to the compression side chamber R2. It is set.

The cylinders 1 are provided with holes 1a and 1b arranged side by side in the same circumferential direction on the left side in FIG. 2 from the center, and holes 1c and 1d provided side by side in the same circumferential direction on the right side in FIG. 2 from the center. And have. The hole 1a and the hole 1c are connected by an extension-side bypass path 8 housed in the tank T, and the hole 1b and the hole 1d are connected by a compression-side bypass path 9 housed in the tank T. ..

When the piston 2 is located between the holes 1a and 1b and the holes 1c and 1d with respect to the cylinder 1, the holes 1a and 1b lead to the extension side chamber R1 and the holes 1c and 1d lead to the compression side chamber R2. Therefore, when the piston 2 is located between the holes 1a and 1b and the holes 1c and 1d with respect to the cylinder 1, the extension side bypass path 8 and the compression side bypass path 9 communicate the extension side chamber R1 and the compression side chamber R2. .. On the other hand, when the left end of the piston 2 in FIG. 2 is on the left side of FIG. 2 with respect to the left end of the holes 1a and 1b in FIG. 2, the holes 1a and 1b are blocked by the piston 2 or the holes 1a, All of 1b, 1c, and 1d are in a state of being connected only to the compression side chamber R2. Therefore, in this case, the extension side bypass path 8 and the compression side bypass path 9 cannot communicate with the extension side chamber R1 and the compression side chamber R2. Further, when the right end of the piston 2 in FIG. 2 is on the right side of FIG. 2 with respect to the right end of the holes 1c and 1d in FIG. 2, the holes 1c and 1d are blocked by the piston 2 or the holes 1a, 1b and 1c are closed. , 1d are all connected only to the extension side chamber R1. Therefore, in this case, the extension side bypass path 8 and the compression side bypass path 9 cannot communicate with the extension side chamber R1 and the compression side chamber R2.

As described above, the extension side bypass path 8 and the compression side bypass path 9 are provided only when the piston 2 is located between the holes 1a and 1b and the holes 1c and 1d with respect to the cylinder 1, that is, on the center side of the cylinder 1. The extension side chamber R1 and the compression side chamber R2 communicate with each other only when the piston 2 is located within a predetermined range to be set. That is, the predetermined range set in the cylinder 1 in which the extension side bypass path 8 and the compression side bypass path 9 communicate with the extension side chamber R1 and the compression side chamber R2 is the position where these holes 1a, 1b, 1c, and 1d are provided. Set by. When the piston 2 is located on both the left and right sides in FIG. 2 beyond the predetermined range set on the center side of the cylinder 1, the extension side bypass path 8 and the compression side bypass path 9 are the extension side chamber R1 and the compression side chamber R2. It will be in a state where it does not communicate with.

The extension side bypass path 8 includes a second extension side damping valve 15 and an extension side speed-dependent opening / closing valve 18 that allow only the flow of liquid from the extension side chamber R1 to the compression side chamber R2 and give resistance to the passing liquid flow. Is provided. As shown in FIG. 2, the second extension side damping valve 15 and the extension side speed-dependent opening / closing valve 18 are mounted on the outer periphery of the cylinder 1 and are housed in the tank T. The second extension side damping valve 15 allows only the flow of hydraulic oil from the extension side chamber R1 to the compression side chamber R2 and provides resistance to the flow of hydraulic oil passing through. More specifically, in the present embodiment, the second extension side damping valve 15 is a pressure regulating valve as shown in FIG. 3, and when the passing flow rate reaches a predetermined flow rate, the pressure loss increases with respect to the flow rate increase. It has a characteristic that the ratio decreases, and has a characteristic that the pressure loss with respect to the passage of the hydraulic oil of the same flow rate is smaller than that of the first extension side damping valve 11.

Further, as shown in FIG. 3, the extension side speed-dependent opening / closing valve 18 has a communication position for opening the extension side bypass path 8 and a blocking position for blocking the extension side bypass path 8, and has an upstream pressure and a downstream side pressure. It opens and closes according to the difference in pressure. More specifically, the extension side speed-dependent opening / closing valve 18 is a normally open type opening / closing valve that functions as an orifice in the communication position and closes when the differential pressure between the upstream side and the downstream side increases as the flow rate increases. In a state where the extension side bypass path 8 effectively communicates the extension side chamber R1 and the compression side chamber R2, the piston 2 is extended when the moving speed to the left in FIG. 3 on the extension side chamber R1 side of the piston 2 becomes equal to or higher than a predetermined speed. Since the flow rate passing through the side speed-dependent opening / closing valve 18 increases, the extension side speed-dependent opening / closing valve 18 closes. In this way, the extension side speed-dependent opening / closing valve 18 opens / closes depending on the moving speed of the piston 2 with respect to the cylinder 1 during the extension operation of the seismic isolation damper D.

The compression side bypass path 9 is provided with a second compression side damping valve 16 and a compression side speed-dependent opening / closing valve 19 that allow only the flow of liquid from the compression side chamber R2 to the extension side chamber R1 and give resistance to the passing liquid flow. ing. As shown in FIG. 2, the second compression side damping valve 16 and the compression side speed-dependent opening / closing valve 19 are mounted on the outer periphery of the cylinder 1 and are housed in the tank T. The second compression side damping valve 16 allows only the flow of hydraulic oil from the compression side chamber R2 to the extension side chamber R1 and provides resistance to the flow of hydraulic oil passing through. More specifically, in the present embodiment, the second pressure side damping valve 16 is a pressure adjusting valve as shown in FIG. 3, and when the passing flow rate reaches a predetermined flow rate, the rate of increase in pressure loss with respect to the increase in flow rate. It has a characteristic that the pressure loss with respect to the passage of the hydraulic oil of the same flow rate is small as compared with the first pressure side damping valve 12.

Further, as shown in FIG. 3, the compression side speed-dependent opening / closing valve 19 has a communication position for opening the compression side bypass path 9 and a blocking position for blocking the compression side bypass path 9, and has an upstream pressure and a downstream pressure. It opens and closes according to the difference. More specifically, the pressure side speed-dependent opening / closing valve 19 is a normally open type opening / closing valve that functions as an orifice in the communication position and closes when the differential pressure between the upstream side and the downstream side increases as the flow rate increases. When the compression side bypass path 9 effectively communicates the compression side chamber R2 and the extension side chamber R1 and the moving speed of the piston 2 to the right in FIG. 3 on the compression side chamber R2 side with respect to the cylinder 1 becomes a predetermined speed or more, the compression side speed Since the flow rate passing through the dependent opening / closing valve 19 increases, the compression side speed-dependent opening / closing valve 19 closes. In this way, the compression side speed-dependent opening / closing valve 19 opens / closes depending on the moving speed of the piston 2 with respect to the cylinder 1 when the seismic isolation damper D is contracted.

Further, the hole 1d provided in the cylinder 1 communicates with the tank T through the discharge side bypass path 10. When the piston 2 is positioned so that the right end of the piston 2 in FIG. 2 is on the left side of the hole 1d in FIG. 2 with respect to the cylinder 1, the hole 1d communicates with the compression side chamber R2, so that the discharge side The bypass path 10 communicates the compression side chamber R2 with the tank T. That is, the discharge side bypass path 10 communicates the compression side chamber R2 with the tank T only when the piston 2 includes a predetermined range with respect to the cylinder 1 and is on the extension side chamber R1 side. On the other hand, when the right end of the piston 2 in FIG. 2 is located to the right in FIG. 2 from the right end in FIG. 2 of the hole 1d, that is, it is located closer to the compression side chamber R2 than the predetermined range with respect to the cylinder 1. Then, since the hole 1d is blocked by the piston 2 or the hole 1d is communicated with the extension side chamber R1, the discharge side bypass path 10 is in a state where the compression side chamber R2 and the tank T cannot communicate with each other. In this way, the compression side bypass path 9 communicates the compression side chamber R2 with the tank T only when the piston 2 is located on the extension side chamber R1 side including a predetermined range with respect to the cylinder 1.

The discharge side bypass path 10 allows only the flow of liquid from the compression side chamber R2 to the tank T, and gives resistance to the flow of liquid passing through the second base valve 17, the discharge side speed-dependent opening / closing valve 20, and the discharge side opening / closing. A valve 21 is provided. As shown in FIG. 2, the second base valve 17, the discharge side speed-dependent opening / closing valve 20, and the discharging side opening / closing valve 21 are mounted on the outer periphery of the cylinder 1 and are housed in the tank T. The second base valve 17 allows only the flow of hydraulic oil from the compression side chamber R2 to the tank T and provides resistance to the flow of hydraulic oil passing through. More specifically, in the present embodiment, the second base valve 17 is a pressure regulating valve as shown in FIG. 3, and when the passing flow rate reaches a predetermined flow rate, the rate of increase in pressure loss with respect to the increase in flow rate increases. It has the characteristic of decreasing, and has the characteristic that the pressure loss with respect to the passage of the hydraulic oil of the same flow rate is small as compared with the first base valve 13.

Further, as shown in FIG. 3, the discharge side speed-dependent opening / closing valve 20 has a communication position for opening the discharge side bypass path 10 and a shutoff position for blocking the discharge side bypass path 10, and has an upstream pressure and a downstream side pressure. It opens and closes according to the difference in pressure. More specifically, the discharge side speed-dependent opening / closing valve 20 is a normally open type opening / closing valve that functions as an orifice in the communication position and closes when the differential pressure between the upstream side and the downstream side increases as the flow rate increases. When the discharge side bypass path 10 effectively communicates the compression side chamber R2 and the tank T, and the moving speed to the right in FIG. 3, which is the compression side chamber R2 side of the piston 2 with respect to the cylinder 1, becomes equal to or higher than the predetermined speed, the discharge side Since the flow rate passing through the speed-dependent opening / closing valve 20 increases, the discharge-side speed-dependent opening / closing valve 20 closes. In this way, the discharge side speed-dependent opening / closing valve 20 opens / closes depending on the moving speed of the piston 2 with respect to the cylinder 1 when the seismic isolation damper D is contracted.

Further, as shown in FIG. 3, the discharge side opening / closing valve 21 includes a communication position for opening the discharge side bypass path 10 and a shutoff position for blocking the discharge side bypass path 10, and the pressure in the hole 1b and the pressure in the hole 1d. It opens and closes according to the difference with the pressure. More specifically, the discharge side opening / closing valve 21 is a normally closed type opening / closing valve that opens when the pressure in the hole 1d becomes larger than the pressure in the hole 1b.

When the piston 2 is located closer to the extension side chamber R1 than the predetermined range with respect to the cylinder 1, the holes 1b and 1d are both communicated with the compression side chamber R2, so that the pressures of both the holes 1b and 1d are equal. The discharge side opening / closing valve 21 maintains a closed state.

When the piston 2 is located within a predetermined range with respect to the cylinder 1, the hole 1b communicates with the extension side chamber R1 and the hole 1d communicates with the compression side chamber R2. In this state, when the piston 2 moves to the extension side chamber R1 side with respect to the cylinder 1, the pressure in the hole 1b becomes higher than the pressure in the hole 1d, so that the discharge side opening / closing valve 21 maintains the valve closed state. Further, in this state, when the piston 2 moves to the compression side chamber R2 side with respect to the cylinder 1, the pressure in the hole 1d becomes higher than the pressure in the hole 1b, so that the discharge side opening / closing valve 21 opens.

Further, when the piston 2 is located closer to the compression side chamber R2 than the predetermined range with respect to the cylinder 1, the holes 1b and 1d are both communicated with the extension side chamber R1, so that the pressures of both the holes 1b and 1d are equal. Therefore, the discharge side on-off valve 21 maintains the closed state.

That is, the discharge side opening / closing valve 21 has a discharge side bypass path only when the piston 2 moves to the compression side chamber R2 side with respect to the cylinder 1 when the discharge side bypass path 10 communicates with the compression side chamber R2 and the tank T. Open 10

The seismic isolation damper D is configured as described above, and its operation will be described below. First, when the seismic isolation damper D exhibits an extension operation while the piston 2 is located within a predetermined range with respect to the cylinder 1, the extension side damping passage 4 and the extension side bypass path 8 provided in the piston 2 function effectively. do. When the moving speed of the piston 2 during the extension operation of the seismic isolation damper D is lower than the predetermined speed, the extension side speed-dependent opening / closing valve 18 opens, so that the extension side chamber R1 compressed by the movement of the piston 2 The hydraulic oil toward the expanding compression side chamber R2 can pass through both the first extension side damping valve 11 and the second extension side damping valve 15. On the other hand, when the moving speed of the piston 2 during the extension operation of the seismic isolation damper D becomes equal to or higher than a predetermined speed, the extension side speed-dependent opening / closing valve 18 closes, so that the extension side chamber compressed by the movement of the piston 2 The hydraulic oil from R1 toward the compression side chamber R2 passes only through the first extension side damping valve 11. Therefore, when the seismic isolation damper D exhibits an extension operation while the piston 2 is located within a predetermined range with respect to the cylinder 1, the seismic isolation damper D has a moving speed of the piston 2 equal to or higher than the predetermined speed. As shown by the line L1 in the middle, a large damping force is exerted, and when the moving speed of the piston 2 is lower than the predetermined speed, a small damping force is exerted as shown in the line L2 in FIG. That is, the seismic isolation damper D changes the damping force according to the moving speed of the piston 2. When the seismic isolation damper D is extended, hydraulic oil for the volume of the rod 3 exiting the cylinder 1 is supplied from the tank T into the cylinder 1 through the suction passage 7, and volume compensation is performed during the extension operation.

Subsequently, when the seismic isolation damper D exhibits a contraction operation while the piston 2 is located within a predetermined range with respect to the cylinder 1, the compression side damping passage 5, the compression side bypass passage 9, and the discharge side bypass passage provided in the piston 2 are provided. 10 works effectively. When the moving speed of the piston 2 during the contraction operation of the seismic isolation damper D is lower than the predetermined speed, the pressure side speed-dependent opening / closing valve 19, the discharge side speed-dependent opening / closing valve 20 and the discharge side opening / closing valve 21 are opened. The hydraulic oil from the compression side chamber R2 compressed by the movement of the piston 2 toward the extension side chamber R1 can pass through both the first compression side damping valve 12 and the second compression side damping valve 16. Further, the hydraulic oil corresponding to the volume in which the rod 3 enters the cylinder 1 passes through the first base valve 13 and the second base valve 17 from the cylinder 1 and is discharged to the tank T. On the other hand, when the moving speed of the piston 2 at the time of contraction of the seismic isolation damper D becomes equal to or higher than a predetermined speed, the pressure side speed-dependent opening / closing valve 19 and the discharge side speed-dependent opening / closing valve 20 are closed, so that the piston 2 is closed. The hydraulic oil from the compression side chamber R2 compressed by the movement toward the expansion side chamber R1 passes only through the first compression side damping valve 12, and the hydraulic oil discharged from the cylinder 1 to the tank T is only the first base valve 13. Pass through. Therefore, when the seismic isolation damper D exhibits a contraction operation while the piston 2 is located within a predetermined range with respect to the cylinder 1, the seismic isolation damper D has a moving speed of the piston 2 equal to or higher than the predetermined speed. As shown by the line L3 in the middle, a large damping force is exerted, and when the moving speed of the piston 2 is lower than the predetermined speed, a small damping force is exerted as shown in the line L4 in FIG. That is, the seismic isolation damper D changes the damping force according to the moving speed of the piston 2.

Further, when the piston 2 is located closer to the extension side chamber R1 than the predetermined range with respect to the cylinder 1 and the seismic isolation damper D exhibits an extension operation, the extension side bypass path 8 leads only to the compression side chamber R2 and the extension side damping. It cannot function as a bypass route that bypasses the passage 4. Regardless of the moving speed of the piston 2 during the extension operation of the seismic isolation damper D, the hydraulic oil from the extension side chamber R1 compressed by the movement of the piston 2 to the compression side chamber R2 expanding is the first extension side damping valve. Only pass through 11. Therefore, when the seismic isolation damper D exhibits an extension operation in a state where the piston 2 is located closer to the extension side chamber R1 than the predetermined range with respect to the cylinder 1, the seismic isolation damper D is shown by the line L1 in FIG. It exerts a large damping force. When the seismic isolation damper D is extended, hydraulic oil for the volume of the rod 3 exiting the cylinder 1 is supplied from the tank T into the cylinder 1 through the suction passage 7, and volume compensation is performed during the extension operation.

Further, when the seismic isolation damper D exhibits a contraction operation in a state where the piston 2 is located on the extension side chamber R1 side from the neutral position with respect to the cylinder 1, the compression side bypass path 9 leads only to the compression side chamber R2. It cannot function as a bypass path that bypasses the compression side damping passage 5. Further, the discharge side bypass path 10 is blocked because the discharge side opening / closing valve 21 is closed, and cannot function as a bypass path bypassing the discharge passage 6. Therefore, regardless of the moving speed of the piston 2 during the contraction operation of the seismic isolation damper D, the hydraulic oil from the compression side chamber R2 compressed by the movement of the piston 2 to the extension side chamber R1 expanding is the first compression side damping valve. The hydraulic oil for the volume that passes through only 12 and the rod 3 enters the cylinder 1 passes only through the first base valve 13. Therefore, when the seismic isolation damper D exhibits a contraction operation in a state where the piston 2 is located closer to the extension side chamber R1 than the predetermined range with respect to the cylinder 1, the seismic isolation damper D is shown by the line L3 in FIG. It exerts a large damping force. When the seismic isolation damper D is extended, hydraulic oil for the volume of the rod 3 exiting the cylinder 1 is supplied from the tank T into the cylinder 1 through the suction passage 7, and volume compensation is performed during the extension operation.

When the piston 2 is located closer to the compression side chamber R2 than the predetermined range with respect to the cylinder 1 and the seismic isolation damper D exhibits an extension operation, the extension side bypass path 8 leads only to the extension side chamber R1 and the extension side damping. It cannot function as a bypass route that bypasses the passage 4. Regardless of the moving speed of the piston 2 during the extension operation of the seismic isolation damper D, the hydraulic oil from the extension side chamber R1 compressed by the movement of the piston 2 to the compression side chamber R2 expanding is the first extension side damping valve. Only pass through 11. Therefore, when the seismic isolation damper D exhibits an extension operation in a state where the piston 2 is located closer to the extension side chamber R1 than the predetermined range with respect to the cylinder 1, the seismic isolation damper D is shown by the line L1 in FIG. It exerts a large damping force. When the seismic isolation damper D is extended, hydraulic oil for the volume of the rod 3 exiting the cylinder 1 is supplied from the tank T into the cylinder 1 through the suction passage 7, and volume compensation is performed during the extension operation.

Further, when the seismic isolation damper D exhibits a contraction operation in a state where the piston 2 is located on the extension side chamber R1 side from the neutral position with respect to the cylinder 1, the compression side bypass path 9 leads only to the extension side chamber R1. It cannot function as a bypass path that bypasses the compression side damping passage 5. Further, the discharge side bypass path 10 is blocked because the discharge side opening / closing valve 21 is closed, and cannot function as a bypass path bypassing the discharge passage 6. Therefore, regardless of the moving speed of the piston 2 during the contraction operation of the seismic isolation damper D, the hydraulic oil from the compression side chamber R2 compressed by the movement of the piston 2 to the extension side chamber R1 expanding is the first compression side damping valve. The hydraulic oil for the volume that passes through only 12 and the rod 3 enters the cylinder 1 passes only through the first base valve 13. Therefore, when the seismic isolation damper D exhibits a contraction operation in a state where the piston 2 is located closer to the extension side chamber R1 than the predetermined range with respect to the cylinder 1, the seismic isolation damper D is shown by the line L3 in FIG. It exerts a large damping force. When the seismic isolation damper D is extended, hydraulic oil for the volume of the rod 3 exiting the cylinder 1 is supplied from the tank T into the cylinder 1 through the suction passage 7, and volume compensation is performed during the extension operation.

Further, when the seismic isolation damper D exhibits an extension operation and the piston 2 moves from the neutral position to the extension side chamber R1 side beyond a predetermined range with respect to the cylinder 1, the extension side bypass occurs when the piston 2 exceeds the predetermined range. The state in which the road 8 is effectively functioning is switched to the ineffective state. When the moving speed of the piston 2 during the extension operation of the seismic isolation damper D is lower than the predetermined speed, the second extension side damping valve 15 is closed when the piston 2 exceeds the predetermined range toward the extension side chamber R1. Since such an effect is produced, the damping force of the seismic isolation damper D transitions from the middle line L2 in FIG. 4 to the line L2 as shown by the broken line arrow. On the other hand, when the moving speed of the piston 2 during the extension operation of the seismic isolation damper D is equal to or higher than the predetermined speed, the extension side speed-dependent opening / closing valve 18 is closed, so that the damping force of the seismic isolation damper D is reduced. Is as shown in the middle line L1 of FIG.

Further, when the seismic isolation damper D exhibits a contraction operation and the piston 2 moves from the neutral position to the compression side chamber R2 side beyond a predetermined range with respect to the cylinder 1, when the piston 2 exceeds the predetermined range, the compression side bypass path 9 and the discharge side bypass path 10 are switched from the effective functioning state to the invalid state. If the moving speed of the piston 2 during the contraction operation of the seismic isolation damper D is lower than the predetermined speed, the second compression side damping valve 16 and the second base valve are released when the piston 2 exceeds the predetermined range toward the compression side chamber R2. Since the effect of closing the valve 17 is produced, the damping force of the seismic isolation damper D transitions from the center line L4 in FIG. 4 to the line L3 as shown by the broken line arrow. On the other hand, when the moving speed of the piston 2 during the contraction operation of the seismic isolation damper D is equal to or higher than the predetermined speed, the pressure side speed-dependent opening / closing valve 19 and the discharge side speed-dependent opening / closing valve 20 are closed. The damping force of the seismic damper D is as shown in the middle line L3 of FIG.

As described above, the seismic isolation damper D of the present invention is slidably inserted into the cylinder 1, the piston 2 that divides the inside of the cylinder 1 into the extension side chamber R1 and the compression side chamber R2, and the cylinder 1. A rod 3 that is inserted and one end of which is connected to the piston 2, a tank T that stores hydraulic oil (liquid), and an extension side damping passage 4 and a compression side damping passage 5 that communicate the extension side chamber R1 and the compression side chamber R2. , Only the discharge passage 6 and the suction passage 7 that communicate the compression side chamber R2 and the tank T, and the hydraulic oil (liquid) provided in the extension side damping passage 4 from the extension side chamber R1 to the compression side chamber R2 are allowed. Only the first extension side damping valve 11 that gives resistance to the flow of the passing hydraulic oil (liquid) and the hydraulic oil (liquid) flow from the compression side chamber R2 to the extension side chamber R1 provided in the compression side damping passage 5 are allowed. Only the first pressure side damping valve 12 that gives resistance to the flow of hydraulic oil (liquid) that passes with it and the hydraulic oil (liquid) that is provided in the discharge passage 6 from the compression side chamber R2 to the tank T are allowed and passed. A first base valve 13 that gives resistance to the flow of hydraulic oil (liquid), and a check valve 14 that is provided in the suction passage 7 and allows only the flow of hydraulic oil (liquid) from the tank T to the compression side chamber R2. The extension side bypass path 8 and the compression side bypass path 9 that communicate the extension side chamber R1 and the compression side chamber R2 and the piston 2 with respect to the cylinder 1 only when the piston 2 is located in a predetermined range set on the center side of the cylinder 1. The discharge side bypass path 10 that communicates the compression side chamber R2 and the tank T and the extension side bypass path 8 are provided from the extension side chamber R1 to the compression side chamber R2 only when the compression side chamber R1 is on the extension side chamber R1 side including a predetermined range. The second extension side damping valve 15 that allows only the flow of hydraulic oil (liquid) and gives resistance to the flow of hydraulic oil (liquid) that passes through, and the extension side bypass path 8 provided in the extension side bypass path 8 are extended. When the side chamber R1 and the compression side chamber R2 are communicated with each other, the extension side speed-dependent opening / closing valve 18 that shuts off the extension side bypass path 8 when the moving speed of the piston 2 to the extension side chamber R1 side with respect to the cylinder 1 becomes equal to or higher than a predetermined speed. The second compression side damping valve 16 provided in the compression side bypass path 9 allows only the flow of the hydraulic oil (liquid) from the compression side chamber R2 to the extension side chamber R1 and gives resistance to the flow of the hydraulic oil (liquid) passing through. When the compression side bypass path 9 is provided in the compression side bypass path 9 and the compression side chamber R2 and the extension side chamber R1 communicate with each other, the pressure is increased when the moving speed of the piston 2 to the compression side chamber R2 side with respect to the cylinder 1 becomes equal to or higher than a predetermined speed. The pressure side speed-dependent opening / closing valve 19 that shuts off the side bypass path 9 and the hydraulic oil (liquid) that is provided in the discharge side bypass path 10 and allows only the flow of the hydraulic oil (liquid) from the compression side chamber R2 to the tank T and passes through. ), And the second base valve 17 provided in the discharge side bypass path 10 and the discharge side bypass path 10 communicating with the compression side chamber R2 and the tank T, the compression side of the piston 2 with respect to the cylinder 1. The discharge side speed-dependent opening / closing valve 20 that shuts off the discharge side bypass path 10 when the moving speed to the chamber R2 side exceeds a predetermined speed, and the discharge side bypass path 10 provided in the discharge side bypass path 10 is the compression side chamber R2 and the tank. It is provided with a discharge side opening / closing valve 21 that opens the discharge side bypass path 10 only when the piston 2 moves to the compression side chamber R2 side with respect to the cylinder 1 when communicating with T.

In the seismic isolation damper D configured in this way, when each of the bypass paths 4, 5 and 10 becomes effective, the second extension side damping valve 15 becomes the first compression side damping valve with respect to the first extension side damping valve 11. The second pressure side damping valve 16 functions effectively with respect to 12, and the second base valve 17 functions effectively with respect to the first base valve 13. Therefore, even when the seismic isolation damper D contracts, if the piston 2 is located within a predetermined range with respect to the cylinder 1 and the moving speed of the piston 2 is lower than the predetermined speed, only the first base valve 13 is used. Since the hydraulic oil (liquid) can be discharged from the inside of the cylinder 1 to the tank T through the second base valve 17, the damping force at the time of contraction operation can be reduced as compared with the conventional seismic isolation damper. Therefore, according to the seismic isolation damper D of the present invention, the damping force characteristics during the extension operation and the contraction operation can be easily matched even if the damping force depending on the displacement can be exerted.

Further, in the seismic isolation damper D of the present invention, not only the damping force is increased or decreased due to the displacement, but also the piston 2 is positioned within a predetermined range with respect to the cylinder 1 when the moving speed of the piston 2 with respect to the cylinder 1 becomes high. Even if it is done, the damping force can be increased. Therefore, even if the seismic isolation damper D is used in combination with the seismic isolation bearing device M, the damping force is reduced for a small-scale earthquake and the seismic isolation effect of the seismic isolation bearing device M is not impaired. It is possible to secure a high damping force against a large-scale earthquake and avoid the structure from falling off from the seismic isolation bearing device M and the collision between the structure S and the retaining wall surrounding the lower end of the structure. ..

Further, in the seismic isolation damper D of the present invention, each bypass path 4, 5, 10 and all valves 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21 are provided in the outer cylinder 24. Since it is accommodated, it can be easily transported without worrying about interference with other parts when it is installed between the structure S and the ground G.

As described above, the first extension side damping valve 11, the second extension side damping valve 15, the first compression side damping valve 12, the second compression side damping valve 16, the first base valve 13 and the second base valve 17 are Both are considered to be pressure regulating valves, but the valve is not limited to this, and any valve that can exert a damping force may be used.

Although the preferred embodiments of the present invention have been described in detail above, they can be modified, modified and modified as long as they do not deviate from the claims.

1 ... Cylinder, 2 ... Piston, 3 ... Rod, 4 ... Extension side damping valve, 5 ... Pressure side damping valve, 6 ... Discharge passage, 7 ... Suction passage, 8 ... extension side bypass path, 9 ... compression side bypass path, 10 ... discharge side bypass path, 11 ... first extension side damping valve, 12 ... first compression side damping valve, 13 ... 1st base valve, 14 ... check valve, 15 ... second extension side damping valve, 16 ... second compression side damping valve, 17 ... second base valve, 18 ... extension side speed dependence Open / close valve, 19 ... Pressure side speed-dependent opening / closing valve, 20 ... Discharge side speed-dependent opening / closing valve, 21 ... Discharge side opening / closing valve, D ... Seismic isolation damper, R1 ... Extension chamber, R2・ ・ ・ Compression side chamber, T ・ ・ ・ Tank

Claims (1)

Cylinder and
A piston that is slidably inserted into the cylinder and divides the inside of the cylinder into an extension side chamber and a compression side chamber.
A rod that is inserted into the cylinder and one end of which is connected to the piston,
A tank for storing liquid and
An extension side damping passage and a compression side damping passage that communicate the extension side chamber and the compression side chamber,
A discharge passage and a suction passage that communicate the compression side chamber and the tank,
A first extension-side damping valve provided in the extension-side damping passage that allows only the flow of liquid from the extension-side chamber to the compression-side chamber and resists the flow of liquid passing through.
A first compression side damping valve provided in the compression side damping passage to allow only the flow of liquid from the compression side chamber to the extension side chamber and to resist the flow of liquid passing through.
A first base valve provided in the discharge passage to allow only the flow of liquid from the compression side chamber to the tank and to resist the flow of liquid passing through.
A check valve provided in the suction passage that allows only the flow of liquid from the tank to the compression side chamber.
An extension-side bypass path and a compression-side bypass path that communicate the extension-side chamber and the compression-side chamber only when the piston is located within a predetermined range set on the center side of the cylinder.
A discharge side bypass path that communicates the compression side chamber and the tank only when the piston is on the extension side chamber side including the predetermined range with respect to the cylinder.
A second extension-side damping valve provided in the extension-side bypass path that allows only the flow of liquid from the extension-side chamber to the compression-side chamber and resists the flow of liquid passing through.
When the extension side bypass path is provided in the extension side bypass path and the extension side bypass path communicates with the extension side chamber and the compression side chamber, the moving speed of the piston toward the extension side chamber side with respect to the cylinder is equal to or higher than a predetermined speed. Then, the extension side speed-dependent opening / closing valve that shuts off the extension side bypass path,
A second compression-side damping valve provided in the compression-side bypass path that allows only the flow of liquid from the compression-side chamber to the extension-side chamber and provides resistance to the flow of liquid passing through.
When the compression side bypass path is provided in the compression side bypass path and the compression side bypass path communicates with the compression side chamber and the extension side chamber, the moving speed of the piston toward the compression side chamber side with respect to the cylinder becomes equal to or higher than a predetermined speed. A compression side speed-dependent opening / closing valve that shuts off the compression side bypass path,
A second base valve provided in the discharge side bypass path to allow only the flow of liquid from the compression side chamber to the tank and to resist the flow of liquid passing through.
When the discharge side bypass path is provided in the discharge side bypass path and the discharge side bypass path communicates the compression side chamber with the tank, the moving speed of the piston to the compression side chamber side with respect to the cylinder is equal to or higher than a predetermined speed. Then, the discharge side speed-dependent opening / closing valve that shuts off the discharge side bypass path,
The discharge side is provided in the discharge side bypass path, and only when the piston moves to the compression side chamber side with respect to the cylinder when the discharge side bypass path communicates the compression side chamber and the tank. A seismic isolation damper characterized by having a discharge side opening / closing valve that opens the bypass path.

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